There is a boat H, its speed in still water is 8 kmph. It covers the distance ā€˜z’ in 9 hours upstream. Now, there is another boat J, whose upstream speed is equal to the downstream speed of boat H. J covers the downstream distance of y km in 1 hour. The speed of J in still water is (y - 4) km/h. Find (y + z)

1
56
2
46
3
48
4
52
5
None of these

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